Davis must have great finishing, adequate shooting, adequate playmaking and world-class interior defence. To have playmaking that you have to go with PF. To have decent shooting you have to have green on your pie graph, otherwise you will have about 50 and NBA 2K21 MT you are able to shoot just from corners and if you know your shot nicely. Red/green pie is the option.Physical - we don't know however how strength is important in 2k21. I like vertical/speed for bigs, but balances can also be good.
Update close shot, driving dip and standing dunk - you will have 7 finishing badges. Will equip big man contact dunks. Should be 14 - sufficient to be in a position to green everything. Playmaking - this is all up to you. If you want really Davis, you can go with article motions. I'd go for pass precision and ball handling, and add a small bit to post moves to have 5 playmaking badges.
Defence - interior, all rebounds, block, lateral quickness. Either move for perimeter defence, or divide the remaining parameters between it and steal. Weight - up for you. May go slightly above moderate to have greater inside defence. Wingspan - max.If you want to go for longer finishing rather than playmaking, make him C. Personally, Im not a lover of completing unless it is possible to equip contact dunks.
ADs really hard to construct - that I created a 6'9 Glass Cleaning Finisher using slasher takeover and maxed shooting, it explained that my build is similar to AD but he can not take outside always such as AD but the shield and inside game is very much like AD. Or you can do like the OP said and earn a glass shooter but then will lack on inside match. There is no ideal build for Buy 2K21 MT him will need to pick between red with finishing, shooting, or playmaking and attempt to balance him according to a favorite play style.